随机裂隙岩体渗流-应力耦合分析的块体单元法  

Block element method for seepage-stress coupling in random fractured rock

作　　者：殷德胜[1] 汪卫明[1] 陈胜宏[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《岩土力学》2011年第9期2861-2866,共6页Rock and Soil Mechanics

基　　金：国家科技支撑计划课题(No.2008BAB29B01)

摘　　要：视岩石裂隙为一种"充填介质",进而将有填充物和无填充物的裂隙统一处理,推导了裂隙面的刚度系数、导水系数和法向应力之间的关系式。在此基础上,根据块体单元法的应力、渗流分析的基本原理,即认为岩块为刚体、变形集中发生于裂隙面,假定岩块不透水、渗流仅通过裂隙面进行,并考虑了法向应力和裂隙面刚度、导水系数的关系式,运用两场交叉迭代法,提出了三维随机裂隙岩体渗流与应力耦合分析的块体单元模型。编写了相应的Fortran程序,该程序将块体元的应力、渗流两个分析模块整合在一起,计算效率较高。该模型的最大优势是能考虑大规模复杂的节理、裂隙,且前、后处理简单。通过沙沱重力坝的分析,验证了方法的准确性和有效性。Rock fractures are assumed as ＂filled medium＂,which enables to treat the rock fractures with or without fillings coincidently.The relationship between the stiffness coefficient,hydraulic conductivity coefficient and the normal effective stress is deduced.Based on the principle of the block element method,seepage-stress coupling model for three dimensional fractured rock mass is built by using the iterative algorithm between the two fields.It treats the blocks as rigid and imperviousness bodies,and the displacement and seepage just mainly happens in fractures.The corresponding program is also written by Fortran language which integrates the stress analysis module and seepage analysis module together.This improves the computational efficiency.Lastly,the Shatuo gravity dam is simulated to verify the proposed method.The most advantage of this model is that large-scaled joints and random fractures are considered;and the preprocessing post-processing are simple.

关 键 词：岩体 随机裂隙 渗流应力耦合 块体单元法 

分 类 号：TU45[建筑科学—岩土工程]